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UNION TOWNSHIP, Ohio – Three-year-old Marcus Fiesel's gruesome murder by his foster parents shocked the community in August 2006. The story was retold in a TV documentary Sunday night.

Liz and David Carroll wrapped Marcus in a blanket, bound him with duct tape and left him in a hot closet without food and water while they went out of town for a weekend family reunion, prosecutors said.

After finding him dead, David Carroll and his live-in lover, Amy Baker, took Marcus' body to a rural area and burned it with gasoline. Then they threw the remains in the Ohio River.

The Investigation Discovery channel looked back at Marcus' story late Sunday night.

Marcus died of heat exhaustion between Aug. 4 and Aug. 6, authorities said. After that, the Carrolls and Baker spent nine days planning a cover-up.

On Aug. 15, Liz Carroll reported Marcus missing. She told police she had taken Marcus and three other children to Juilfs Park in Anderson Township. She said she passed out because of low blood pressure and when she recovered, Marcus was gone.

A week later, Carroll held a news conference at the park and made a televised plea for help in finding the boy.

Thousands of people searched the area for days.

Within a week, though, Baker told authorities that the Carrolls killed the child, and the foster parents were arrested.

Liz Carroll was found guilty and was sentenced to 54 years to life. David Carroll took a plea deal and got 16 years to life.

Angry that Baker got off scot-free, a Kentucky prosecutor charged her with tampering with evidence for dumping the remains within Kentucky's jurisdiction. Those charges were dropped.

Baker was convicted on a drug charge in Ohio and spent a few months in prison.

Marcus' death put the spotlight on failings in the foster care system. The non-profit that placed Marcus with the Carrolls lost its license.

New laws put tougher restrictions on foster parent eligibility and require closer screening of applicants and more training. They also require daily background checks on foster parents and regular checks on children.